Beam scale and method of adjusting



June 5, 1928.

J. E. SEEDERER- BEAM SCALE AND METHOD OF ADgTUSTNG Filed March 23, 1928 mlm.

INVENTOH JACOB ENILSEEDERER.

JIA/- Patented J une 5, '71928.

y,url lrll) Simmsr PATENT omer.

JACOB lSEIFIIIlBJlR, OF VJERSEY CITY, NEW JERSEY,v `ASSIG'IN'OR. TO SEEDERER- KOHLBUSCH, INC., F JERSEY CITY, NEW JERSEY, A CORPORATION OF NEW JER- l BEAM SCALE AND METHOD 0F ADJUs'rINol 'l Application 'med Marchas, 192s. serial Np. atacar.y

This invention, relates to a beam `'scale and has for an Object to efficient andyaccurate ysca e which can be economically .manufactured l and adjusted l aiidvvill enable small quantitiesto be quick` ly and accurately measured.

beam'is generally very light and must be very-finely balanced. Under such circumstances, the alignment Aof the pivots andthe variations in the distribution of the mass of ,the k,beam throughout itsl length must more carefully be considered than in a heavier beam. If. a very lightbeam is provided k'with spaced Vnotches to supporta movable poise weight,`the placing vrof thexnotchesso that equal masses of lthe beam -lie between them spra'ctically.impossible. l y

. This invention concerns a light weighing beamr having two weighing arms, o n one of which are aplurality ofgraduations and a small sliding weight and `on. the other of which are a pluralit of pivots atgraduated 'distancesapartV pre erably inl decimal multiples of the. smallgraduations on ythe first4 arm, VeachY ofsaid'pivots being adapted 'to receivea poise weight-A vload pan is `supported on the side of the main pivot. opposite the poise weight. If the capacity of thescale is one pound, Athe weight between poise pivots may represent tenthsof a pound.

.In thisease the total range of the sliding Scaleonthe kother arm kwould represent a tenth of a pound and thisarm would preferably be4 graduated downto `thousandths of a pound., Consequently very small lweights'v can with Aprecision be accurately determined and directly read.

4 The..poise pivots are Iwith approxii'nate accuracy inserted'ontheir arm but are ad-r instable in their mountings so that in calibrating, the pivot edges can be quickly and exactly-'adjusted so that the .distance between ythe p0se-pivot edges" can be'. made to com-l ensate for variations. in the mass. of the eamftherebetv'veen. [The line ofthe main and load pivot edges is designed to beA substantially coincident-With the longitudinal axis ofthdcenter of 4gravity of the beam. Preferably the poise .pivots are provided with stems telit into holes on the arm carryi-ng them. These stems are provided .withA rovide a simple,`

fastening means such as nuts so that after the pivots have been rotated to bring their edgesto the proper point along the beam, the pivots can be securely fastened. This beam, therefore, can be quickly and acy Y, curately calibrated vand is as symmetrically In beam scales for weighing small quantities such as a. thousandth of a pound, ,the`

balanced as is possible and considerable time and labor is saved in the manufacture Aand adjustment of the scale.

A preferredform of the invention is il- .i

ylustrated inthe drawings of which,

Fig. 1 is a side elevation of the scale;

Fig. 2 is a transverse section taken on `the line 2--2 of Fig. 1; f

Fig. 3 is a transverse section taken on the line ofy Fig'. 1*;

Fig. 4 is a transverse sectiontaken on the4 line 4 4 of Fig. 1.

In the drawings, the scale shown comprises a base 10, having a levelling screw 11 and apedestal12. kAt one end of the pedestal is. an upright arm 13 having a flat upper surface .14 on which is mounted a brass cast ying 15 supporting a knife edge bearing V1,

preferably of quartz.y 'The retaining plates 17 andV 18 arevfastened to the ycasting 15 at opposite ends thereof extending above the quartz bearing 16 to yact as retaining plates for a steel knife edge bearing 19. This steel knife edge bearing is Vmounted in the weighing beamr20 and isthe main bearing for the scale. As shownA in Fig. 1 the beam to theright of the main bearing is formed into a lowerarm 21 and an upper arm 22.

At the vouter endthese arms are joined by a cross piece ,23 to which a suitable pointer 24 is fastened. This pointer is adapted to travel ina slot, not shown, in an upright plate 25 fastened to the end "of the pedestal 12 opposite the upright 13.y This plate 25 has an indicator plate 26 attached thereto vwith markings for high and low weight and neutral point.

To the left vof the main pivot the Weighing ybeam is formed with a downwardly and in- Wardly turned arm 27 on the upper surface of which is disposed a steel knife edge 28. This knife edge is adapted to engage With a, quartz bearing member 29 mounted in a yoke member y30 to the lower end of which is connected a Wire link 31 supporting the a'IIn32 Which atv its lower end is split'into two arms such as 33, Vonly one of which is support, an' additional weight.

shown, to support a pan 34. The link 3l is provided with a lateral extension hook 35 to At theleft of the weighing beam a threaded shaft 36 on which .balanceV weightsY 37 and 38 are mounted. These weights act as ylock nuts for each other. 1A guard platev 39 is adjustably fastened to the weighing beam above the top of yoke vmember 30 with its lower edge rather close to thetop of the yoke member to reep it from coming off the knife edge 28.

rlhe upperarin the weighing beam is v"provided witha scale 40, eachof the graduations of which for exam le will re resent.

a thousandth lofa pound. A sliding weight 4l moves along this arm. The lower arm 2lis provided with a plurality of adjust-able knife edge loearing members"42V spaced a suitable distance apart and acting as supportsr for a weight 43.' `These adjustable vbearings orpivots are spaced7 for. in :15am

.. a distance' apart corresponding toA a tenth of a pound. l/Vith the parts, as shownin F ig. 1,'1 with 'both weigths 4l and 43 in their extreme left hand positions, the scalewillv balance with no weight inthe pan.y

Referring to Fig. 4in which the detail construction lof the knife edge pivotsj42 is shown it will be apparentthat at each point where` a pivot is located the arm 21 is 'provided with asuitable aperture such as 44..

.fTlie vpivot'member isl provided with a threaded shaftl 45 'extending through said aperture and beyond same to receive a nut 45 which lwill tighten the pivot member in position. The main portion of the" pivot member isy larger in diameter than shaft 45 and consequently forms a shoulder 47 which bears against the front faceof'the arm 2l.

` The'main portion of the pivot member, as

shown, is formed withv al knife edge 48,

l which viewing the pivot' from the side, 'as

exactly the right place.

shown in'Fig. 4,*is also curved.` In adjust? ing the'. pivotsf42`, for example,v the `weight.

43`is hung on theffirst pivot,V as shown7 with thesliding weight4l on its yzero mark and if the" knife edgeof that particular pivot is` in the correct position the scale will balance with the pointer` 24 on zero. lf the scale does not balance, the'nut yon the back of the pivot is loosened slightly so that the pivot can beturned on its axis ever soslightly in one direction or another until it is in the right position to balance, whereupon the nut is tightened and then the pivot is thus easily and quickly'disposed with tsknife edge in p The` weight 43 is then placed on the next 'pivot to the right,- which in accordancel with the scale indicated above, would represent a weight of a tenth of a pound. A standard" weight in this amount is placed in the pan and if the knife edge of the pivot on which the weight 43 is hung is in the c'orrectsposition'the scale will balance. Otherwise the same procedure is adopted to adjust thel knifev edge as before.` This procedure is followed for l each pivot throughout the length` of the lower arm and consequently provides a simple, efficient and speedy methodwhereby the points ofsupport for theweight 43 can be very quickly and accurately adjusted',

- It will benoticed that the beam is light in Weight and thatby reverse-ly` curving the left hand end Vof the beam, the knife edge pivot for the scale pan can be brought close to the main pivot. Furthermore the axis of the shaft 36 for the balance weights .37 and 38'are in line with the knife edges 28 and 19. KThis line is designed to coincide as far aspossible with ythe longitudinal axis of the center of gravity of thebeamthus insuring affiner balance. .n x l "Thisscale, therefore, :can be'calibrated-'in terms of poundsand small fractions'pf a sample materials. 'Only one sliding weight is used and one poise weight; The full scale movement of the slidingweight represents;

the same diiference in weight'as would occur poundto read thezweight'direct in ydecimals A and is particularly adapted to. 'weighing by advancing the poise:weightonepivotv VIn o'therrwords, in accordance with the scale def scribed, the 'weight 'betweentheipivots' isa hundredth of a pound and the' full`l scale movement of the Vweight 4l represents'a tenth'of a Vpounddivided upinto one hundred'parts, each graduation vbeingra thou- V sandth of a pound; i p l. Itis toy be vunderstood that when I' use the V4term .knifeedge pivot, I intend this".

Vterm to include not onlythe. knife edgev `cooperating socket or" y 105 member itself but its receiving jmember.

i I claim:

having unequal longitudinal `mass distribution, and a plurality of `*adj ustable knife edge pivots onsaid beam each adapted to support an auxiliary 'p eightdisposed"Y with.` regard to saidrdistribution.` 2: scale comprising a `weighing :beam

' 1. A scalecomprising a1 weighing beam' having an upper andl a'lower weighing'b'ar a plurality of adjust-able knife'edge pivots lLA scale comprising au weighingbeam rv having an upper andlower weighing'bar; a plurality of adjustable knife edgev pivots on thelower ybarlocated externally ofthe main pivot of the beam and a movable Weight on the upper bar.

5. A scale comprising a Weighing beam having a main knife edge pivot, a load knife edge pivot and a tare Weight shaft on one side of said main pivot, and a pointer on the other side of the main pivot, the aXis of said shaft, the edges of said pivots andthe axis of the pointer being disposed substantially along the longitudinal axis of the cen-k ter of gravity of the beam.

6. A scale comprising a Weighing beam having a main pivot, the beam on one side of said pivot being turned downwardly and inwardly toward the main pivot and a load pivot disposed on the inwardly turned portion. f

7 A supporting link for scales comprising a loop portion from which an article can be supported and an oiset hook portion adapted to act as an auxiliary support. v

8. In a scale the combination with a Weighing beam having an aperture therein, of a knife edge pivot` having a stem extending through said aperture, a shoulder on the main portion of the pivot member to bear against the face of the beam and means on theend of the stem for tightening the pivot on the beam in an adjusted position.

9. In a scale the combination With a Weighing beam having an aperture therein, of a knifeedge pivot having a threaded stem extending through -said aperture, a shoulder on the main portion of the pivot member to bear against the face of the beam and a nut on the stem for tightenin the pivot on the beam in an adjusted posltion.

l0. A scale comprising a flat bar beam.

having a supporting means adjacent one end, a load carrying means on one side thereof, and a plurality of unit graduated balance Weight supporting portions on ythe other side disposed vertically one over the other in determined relation to said supporting and load carrying means, a unit graduation on one portion being a multiple of a unit aduation on the other portion, an adjusta le knife edge pivot for each of the large units extending laterally of the bar, and movable balance Weights for the respective portions.

Signed at Jersey City in the county of Hudson and State of New Jersey, this th day of March A. D. 1928.

JACCB EMIL SEEDERER. 

